Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce45fdb0a762fc1…

MALICIOUS

PDF

86.1 KB Created: 2021-09-16 10:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 494898a7919cbc847f41ddf910c8f31b SHA-1: 08285898e409c2ee845d5fc414e81308b61441ab SHA-256: 7ce45fdb0a762fc1a7cde78acbb2d21a53818fbf0fd92ab6385b6aea0bd653a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=v+recorder+download+apk PDF link annotation
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/bogafiragebewit.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/lijenududujisokivo.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109122317517419.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/ronaxujutileremenopofi.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/fasunowevu.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/fekusosujosirefeb.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/71038826624.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd58c66f4---55566906682.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/wixalokonutojowo.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/nigikakowiwibuvireperin.pdfIn PDF document text
    • http://szhlfz.net/upload/varenezamexudubebubizun.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/11297187402.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9fd078b96---61388527049.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/43360391162.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/lojifatifimovodepo.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109121349019523.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/5102249329.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/tizojarukajivexot.pdfIn PDF document text
    • http://momsystem.ru/public/file/59401176002.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/26233996334.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/dosujupadutijogenuz.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/kajozixovupawizikurul.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/bb54ede7906d9a3a90384a9508142e7c/36428829784.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/94340795557.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/50601505151.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 18960 bytes
SHA-256: 9709aa51d4a4b2d701637a1a2c50862b39bf252e983b7890ab19f5920dac140e
font_01_sfnt_off00011b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 10296 bytes
SHA-256: 211cb904d393fdbe77bfc87edb8da8067646031214800fce8d489e27354feead
font_02_sfnt_off0001328f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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